hmmmm ... wellll ... I guess it depends on one's definition of addiction vs habit (or indeed is there a difference at all). If it is a matter of scale, then I would think a lifestyle which descends to the point where your main task of existence each day is finding a way to supply your 'habit' so as not to fall into serious physical withdrawal, qualifies as addiction.

If the definition is one of physical addiction vs psychological addiction, then I would say that it is just an issue of the physical withdrawal symptoms (e.g. heroin) vs psychological withdrawals (e.g. cannabis). But I certainly did qualify on that score.

Without going into to many gory details, I think it is probably not possible to consume the sheer quantities of narcotics (in particular) that I did on a daily basis through the years when my usage was at it's heaviest, without becoming addicted.